Don't psych yourself out bro. If you are going in upper and outer part of the glute you won't hit a bone I promise! It might feel like the bone when you push with your fingers but there is probably a couple inches of muscle and fat there. Make sure you go straight in and straight out on the same angle. I find if I lean against the bathroom counter and relax and bend my leg slightly it makes it much easier aswell. Go in quick and smooth asperate, if no blood just some bubbles push the oil in for a count of 10, then remove the needle for a count of about 5 then apply pressure with coton ball and massage for a minute.
1.5" is perfect for the glutes. i use em for my quads also. 1" i save for my delts. You wont hit bone. check out a thread on the HardBody sponsor page called idiots guide to anabolic steroids posted by Brandon123. It has a great portion on it for guys new to injecting.